Digital ink-jet printer with paper powder cleaning or on-line coating function
By designing a paper powder cleaning mechanism combining cleaning rollers and rollers in a single-sheet digital inkjet printing machine, the problem of difficulty in removing paper powder and paper frost on the surface of the paper is solved, effectively preventing blockage of the inkjet head, and ensuring the quality of the printing product and printing efficiency.
Patent Information
- Application Number
- CN202422021049.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-20
- Publication Date
- 2025-06-24
- Estimated Expiration
- 2034-08-20
AI Technical Summary
During the paper transfer process, existing single-sheet digital inkjet printing machines are difficult to effectively remove paper powder on the paper surface and paper frosts on the edge of the paper, resulting in clogging of the inkjet head and affecting the quality of the printing product and printing efficiency.
A digital inkjet printing machine with paper powder cleaning function is designed. It adopts a structure that combines the cleaning roller with the surface of the drum. It contacts the paper surface with a high-speed rotating cleaning roller surface, and combines high-speed airflow and friction to quickly remove paper powder and paper frost on the surface of the paper, and eliminates paper powder and paper frost through a dust collecting cover.
It effectively avoids the problem of inkjet head being blocked by paper powder, ensures the quality of printing and efficient printing, and extends the service life of inkjet head.
Smart Images
Figure CN223014188U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of inkjet printing equipment, and particularly relates to a digital inkjet printer with a function of paper powder cleaning or on-line coating. Background Art
[0002] The single-sheet digital inkjet printing machine is a new type of high-tech equipment that has just emerged in recent years. It can achieve high-precision printing operations on single sheets of paper and has the advantages of plate-free printing, on-demand printing, high speed, and high quality.
[0003] To achieve high-precision printing operations, the single-sheet digital inkjet printer usually uses a suction belt or a drum with a paper gripper mechanism for paper transfer operations. As the printing medium, the paper usually has residual paper powder on its surface and residual paper fluff at its edges. When the paper reaches under the inkjet head for inkjet printing, the airflow will cause the paper powder on the paper surface or the paper fluff at the paper edges to fly up, which easily causes the problem of the inkjet head being blocked by paper powder, thereby seriously affecting the print quality or the printing efficiency due to shutdown for maintenance. Currently, in single-sheet digital inkjet printers that use drums to transfer paper, due to the precise transfer requirements of single sheets of paper and being restricted by factors such as small structural design space and immature technology, no mechanism for on-line cleaning of paper powder and paper fluff is provided, and they cannot meet the high-efficiency and high-quality printing requirements of high-end customers.
[0004] In addition, in order to improve the printing quality and image quality, some high-quality papers need to be coated with a specific medium (coating liquid) before inkjet printing to improve the ink absorption rate. Currently, in the field of single-sheet inkjet printing, this coating process requires a separate device, which not only has low work efficiency, but also has high equipment investment and high production costs. Summary of the Utility Model
[0005] One of the technical problems to be solved by the utility model is to provide a digital inkjet printer with a paper powder cleaning function, which has a reasonable structural design, can effectively and quickly remove the paper powder on the paper surface and the residual paper fluff at the paper edges, and thus avoid the inkjet head being blocked by paper powder.
[0006] To solve the above technical problems, the technical solution of the present utility model is as follows: A digital inkjet printer with a paper powder cleaning function, which includes a paper feeding unit, a printing unit, and a paper receiving unit. The printing unit includes a printing cylinder and a printing module located above the printing cylinder. A first cylinder and a second cylinder are arranged between the paper feeding unit and the printing unit. The first cylinder is connected to the paper output end of the paper feeding unit, and the second cylinder is respectively connected to the first cylinder and the printing cylinder. Gripper jaws are respectively installed on the first cylinder, the second cylinder, and the printing cylinder. A cleaning roller is rotatably installed above the first cylinder. A channel for a single sheet of paper to pass through is formed between the surface of the cleaning roller and the surface of the first cylinder. When the paper passes through the channel, the roller surface of the cleaning roller contacts the surface of the paper.
[0007] As a preferred technical solution, a dust collection cover is provided on the periphery of the cleaning roller, and a suction port is opened on the dust collection cover.
[0008] As a preferred technical solution, the rotation direction of the cleaning roller is the same as that of the first cylinder.
[0009] As a preferred technical solution, the cleaning roller is a brush roller.
[0010] Compared with the prior art, the present utility model has at least the following beneficial effects: Through innovative design, a paper powder cleaning mechanism is first set on a single-sheet digital inkjet printer that uses cylinders to transfer paper. When the paper fed sheet by sheet through the paper feeding unit passes through the channel formed between the cleaning roller and the surface of the first cylinder, the roller surface of the cleaning roller rotating at high speed instantaneously contacts the surface of the paper being conveyed forward synchronously. Under the action of high-speed airflow and friction, the paper powder on the surface of the paper and the paper fluff remaining at the edges of the paper can be quickly removed online. The desorbed paper powder and paper fluff are then concentrated and discharged to the outside through the dust collection cover. In this way, when the paper is transferred through the second cylinder and reaches the printing cylinder for printing operations, the surface of the paper that has been cleaned is exactly the printing surface, which can avoid the problem that the paper powder on the printing surface is lifted by the high-speed airflow and causes the inkjet head to be blocked by paper powder, thereby effectively ensuring the print quality and efficient printing, and extending the service life of the inkjet head.
[0011] The second technical problem to be solved by the present utility model is to provide a digital inkjet printer with an online coating function.
[0012] To solve the above technical problems, the technical solution of the present utility model is: a digital inkjet printer with an online coating function, including a paper feeding unit, a printing unit, and a paper receiving unit. The printing unit includes a printing cylinder and a printing module located above the printing cylinder. A first cylinder and a second cylinder are arranged between the paper feeding unit and the printing unit. The first cylinder is connected to the paper output end of the paper feeding unit, and the second cylinder is respectively connected to the first cylinder and the printing cylinder. Gripper bar trains are respectively installed on the first cylinder, the second cylinder, and the printing cylinder. A first coating roller is rotatably installed above the first cylinder. A channel for a single sheet of paper to pass through is formed between the surface of the first coating roller and the surface of the first cylinder. When the paper passes through the channel, the roller surface of the first coating roller contacts the surface of the paper. A second coating roller is cooperatively installed on the side of the first coating roller, and a metering roller is cooperatively installed on the side of the second coating roller. A liquid supply gap is formed between the second coating roller and the metering roller.
[0013] As a preferred technical solution, the roller diameter of the first coating roller is larger than that of the second coating roller.
[0014] As a preferred technical solution, the metering roller is connected with a liquid supply gap adjusting mechanism.
[0015] Compared with the prior art, the present utility model has at least the following beneficial effects: Through innovative design, a coating mechanism is first set on a single-sheet digital inkjet printer that uses cylinders to transfer paper. Different coating thicknesses can be achieved through the cooperation of the metering roller and the second coating roller. The first coating roller further distributes the coating liquid on the roller surface evenly. When the paper fed sheet by sheet through the paper feeding unit passes through the channel formed between the surface of the first coating roller and the surface of the first cylinder, the first coating roller can evenly coat the coating liquid on the surface of the paper, eliminating the need to set up a separate coating process and equipment, greatly improving the working efficiency, and reducing the equipment investment and production cost. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The following drawings are only intended to illustrate and explain the present utility model schematically and do not limit the scope of the present utility model. Among them:
[0017] Figure 1 is a schematic structural diagram of Embodiment 1 of the present utility model;
[0018] Figure 2 is a schematic structural diagram of the paper powder cleaning mechanism in Embodiment 1 of the present utility model;
[0019] Figure 3 is a schematic structural diagram of Embodiment 2 of the present utility model;
[0020] Figure 4 is a schematic structural diagram of the coating mechanism in Embodiment 2 of the present utility model.
[0021] In the figure: 10 - paper feeding unit; 11 - paper feeding table; 12 - paper conveying cross-bridge; 20 - inkjet printing unit; 21 - printing cylinder; 22 - printing module; 30 - paper receiving unit; 31 - paper receiving wheel; 32 - paper receiving chain; 40 - paper powder cleaning mechanism; 41 - first cylinder; 42 - second cylinder; 43 - cleaning roller; 44 - dust collection hood; 45 - air suction port; 50 - paper; 60 - coating mechanism; 61 - first coating roller; 62 - second coating roller; 63 - metering roller; 64 - liquid supply gap adjustment mechanism. Detailed implementation mode
[0022] The present utility model will be further elaborated below in conjunction with the accompanying drawings and embodiments. In the following detailed description, only some exemplary embodiments of the present utility model are described by way of illustration. Undoubtedly, those of ordinary skill in the art can recognize that the described embodiments can be modified in various different ways without departing from the spirit and scope of the present utility model. Therefore, the accompanying drawings and the description are illustrative in nature and are not used to limit the protection scope of the claims.
[0023] Embodiment 1
[0024] As Figure 1 shown, a digital inkjet printer with a paper powder cleaning function includes a paper feeding unit 10, an inkjet printing unit 20, and a paper receiving unit 30. In this embodiment, the paper feeding unit 10 includes a paper feeding table 11 and a paper conveying belt 12, the inkjet printing unit 20 includes a printing cylinder 21 and a printing module 22 located above the printing cylinder 21, and the printing module 22 performs printing operations on the paper attached to the printing cylinder; the paper receiving unit 30 includes a paper receiving wheel 31 and a paper receiving chain 32, and a paper receiving tooth row is installed on the paper receiving chain 32. The above structures are well-known and commonly used structures in the art and will not be elaborated here.
[0025] A paper powder cleaning mechanism 40 is installed between the paper feeding unit 10 and the inkjet printing unit 20. Referring to Figure 2 , the paper powder cleaning mechanism 40 includes a first cylinder 41 and a second cylinder 42. The first cylinder 41 is connected to the paper output end of the paper feeding unit 10, the second cylinder 42 is respectively connected to the first cylinder 41 and the printing cylinder 21, and paper holding tooth rows for biting and transferring the paper are respectively installed on the first cylinder 41, the second cylinder 42, and the printing cylinder 21; a cleaning roller 43 is rotatably installed above the first cylinder 41, and a channel for a single sheet of paper to pass through is formed between the cleaning roller 43 and the surface of the first cylinder 41. When the paper passes through the channel, the roller surface of the cleaning roller 43 is in contact with the surface of the paper.
[0026] The cleaning roller 43 is preferably a brush roller, and its rotation direction is the same as that of the first roller 41. In this way, when the paper 50 passes through the channel between the cleaning roller 43 and the first roller 41, the paper conveying direction is opposite to the rotation wiping direction of the cleaning roller 43. On the one hand, the relative linear velocity of the contact surface between the paper and the cleaning roller 43 can be increased, thus forming an "air knife" effect to accelerate the separation of the paper powder on the paper surface, and further improving the cleaning effect of the paper surface; on the other hand, the rotation wiping direction is from the paper head end to the paper tail end. After the paper head end is held by the gripper jaw row, the paper will not form wrinkles due to friction.
[0027] Refer to Figure 2 , a dust collection cover 44 is provided on the circumferential side of the cleaning roller 43. An air suction port 45 is opened on the dust collection cover 44, and the air suction port 45 is connected to a negative pressure fan. Through the dust collection cover 44, it is convenient to centrally collect and discharge the paper powder and paper fluff detached from the paper surface to the outside, avoiding the re-aggregation and sedimentation of the paper powder or paper fluff on the paper surface to form secondary pollution.
[0028] Refer to Figure 1 , the working principle of the present utility model is as follows: The paper feeding unit 10 successively outputs papers 50 one by one. After the paper head of the paper is held by the gripper jaw row on the first roller 41, the paper adheres to the surface of the first roller 41 and rotates with the roller. When the paper passes through the channel formed between the cleaning roller 43 and the surface of the first roller 41, the roller surface of the cleaning roller 43 rotating at high speed is in instantaneous contact with the surface of the paper being conveyed forward synchronously. Under the action of the high-speed air flow and the frictional force, the paper powder on the paper surface and the paper fluff remaining at the edge of the paper can be quickly removed online. The detached paper powder and paper fluff are then centrally discharged to the outside through the dust collection cover 44. In this way, when the paper is transferred to the printing roller 21 for printing operation after passing through the second roller 42, the surface of the paper that has been cleaned is just the printing surface, which can avoid the problem that the paper powder on the printing surface is lifted by the high-speed air flow and causes the inkjet head to be blocked by the paper powder, thus effectively guaranteeing the printing quality and high-efficiency printing. In this embodiment, a third roller 33 and a fourth roller 34 are installed below the printing roller 21. The printed paper is conveyed to the paper receiving unit 30 through the third roller 33 and the fourth roller 34 to complete the paper receiving operation. The overall structure is reasonably designed, which is conducive to the stable transfer of the paper, so as to achieve high-speed and high-quality printing.
[0029] Embodiment 2
[0030] As Figure 3 shown, a digital inkjet printer with an online coating function includes a paper feeding unit 10, a printing unit 20, and a paper receiving unit 30. The structures of the above units are the same as those in Embodiment 1, and will not be described in detail here.
[0031] In this embodiment, a coating mechanism 60 is installed between the paper feeding unit 10 and the printing unit 20. Refer to Figure 4, the coating mechanism 60 includes a first roller 41 and a second roller 42. The first roller 41 is connected to the paper output end of the paper feeding unit 10. The second roller 42 is respectively connected to the first roller 41 and the printing roller 21. Gripper bar trains for gripping and transferring the paper are respectively installed on the first roller 41, the second roller 42 and the printing roller 21. A first coating roller 61 is rotatably installed above the first roller 41. A channel for a single sheet of paper to pass through is formed between the surface of the first coating roller 61 and the surface of the first roller 41. When the paper passes through the channel, the roller surface of the first coating roller 61 contacts the surface of the paper. A second coating roller 62 (preferably a hard rubber roller) is cooperatively installed on the side of the first coating roller 61. A metering roller 63 (preferably a rubber roller) is cooperatively installed on the side of the second coating roller 62. A liquid supply gap D is formed between the second coating roller 62 and the metering roller 63.
[0032] The metering roller 63 is connected to a liquid supply gap adjusting mechanism 64. By adjusting the distance between the metering roller 63 and the second coating roller 62 through the liquid supply gap adjusting mechanism 64, different coating thicknesses can be achieved. During the coating operation, the coating liquid is transported to the liquid supply gap by the conveying mechanism. As the second coating roller 62 rotates, the coating liquid is coated on the surface of the second coating roller 62. The second coating roller 62 transfers the coating liquid to the first coating roller 61, which can further distribute the coating liquid on the roller surface evenly, improving the axial and radial uniformity. In this way, when the paper fed sheet by sheet through the paper feeding unit passes through the channel formed between the surface of the first coating roller 61 and the surface of the first roller 41, the first coating roller 61 evenly coats the coating liquid on the surface of the paper, eliminating the need to set up a separate coating process and equipment, greatly improving the working efficiency and reducing the equipment investment and production cost.
[0033] In order to fully improve the coating effect, the roller diameter of the first coating roller 61 is preferably larger than that of the second coating roller 62.
[0034] The above are only the schematic specific embodiments of the present invention and are not intended to limit the scope of the present invention. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of the present invention shall fall within the scope of protection of the present invention.
Claims
1. A digital inkjet printer with a paper powder cleaning function, comprising a paper feeding unit, a printing unit and a paper receiving unit, wherein the printing unit comprises a printing roller and a printing module located above the printing roller; characterized in that: A first roller and a second roller are arranged between the paper feeding unit and the printing unit, the first roller is connected with the paper output end of the paper feeding unit, the second roller is connected with the first roller and the printing roller respectively, and the first roller, the second roller and the printing roller are respectively provided with a paper gripper row; a cleaning roller is rotatably installed above the first roller, a channel for a single sheet of paper to pass through is formed between the cleaning roller and the surface of the first roller, and when the paper passes through the channel, the roller surface of the cleaning roller contacts the surface of the paper.
2. The digital inkjet printer with paper dust cleaning function as claimed in claim 1, characterized in that: The peripheral side cover of the cleaning roller is provided with a dust collecting cover, and the dust collecting cover is provided with an air suction port.
3. The digital inkjet printer with paper dust cleaning function as claimed in claim 1, characterized in that: The rotation direction of the cleaning roller is the same as the rotation direction of the first roller.
4. The digital inkjet printer with paper dust cleaning function according to any one of claims 1 to 3, characterized in that: The cleaning roller is a brush roller.
5. A digital inkjet printer with online coating function, comprising a paper feeding unit, a printing unit and a paper receiving unit, wherein the printing unit comprises a printing roller and a printing module located above the printing roller; characterized in that: A first roller and a second roller are arranged between the paper feeding unit and the printing unit, the first roller is connected with the paper output end of the paper feeding unit, the second roller is connected with the first roller and the printing roller respectively, and the first roller, the second roller and the printing roller are respectively provided with a paper gripper row; a first coating roller is rotatably installed above the first roller, a channel for a single sheet of paper to pass through is formed between the first coating roller and the surface of the first roller, and when the paper passes through the channel, the roller surface of the first coating roller contacts the surface of the paper; a second coating roller is cooperatively installed on the side of the first coating roller, a metering roller is cooperatively installed on the side of the second coating roller, and a liquid supply gap is formed between the second coating roller and the metering roller.
6. The digital inkjet printer with online coating function as claimed in claim 5, characterized in that: The roller diameter of the first coating roller is larger than the roller diameter of the second coating roller.
7. The digital inkjet printer with online coating function according to claim 5 or 6, characterized in that: The metering roller is connected with a liquid supply gap adjustment mechanism.